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-4n-1=5n-9
We move all terms to the left:
-4n-1-(5n-9)=0
We get rid of parentheses
-4n-5n+9-1=0
We add all the numbers together, and all the variables
-9n+8=0
We move all terms containing n to the left, all other terms to the right
-9n=-8
n=-8/-9
n=8/9
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